I'd say we do more often than not, although less that it used to.
Lunches more mixed - could be a soup for example or a sandwich (usually tuna or a hot roast beef/chicken for me, DH will have either tuna or cheese), beans on toast or a jacket potato (which could have a veggie or non-veggie topping - chilli con carne, veggie chilli, beans and cheese etc).
Evening meals are more likely to contain meat but could be small quantities like a risotto or fried rice with one chicken breast between the three of us (DH, me and 4 yr old DD). Plenty of veggie dishes like veggie pasta sauce with halloumi, mixed bean chilli, paneer curry, halloumi fajitas... Sometimes will also be a meat bolognese or chilli, chicken curry, chicken fajitas sausages, tuna pasta bake, a roast etc where the meat is a more substantial part.
I'll often use small amounts of something like chorizo to add flavour to a rice or pasta dish that doesn't have any other form of meat or fish though.
At a guess I'd say we eat veggie evening meals 1-2 times a week and meat/fish the rest of the time.
We used to eat more omelettes and things like that for lunches but recently eggs have started to disagree with me unless they're hard boiled, which is a shame.
I think my issue with catering for someone vegetarian is most of my veggie dishes feel very "quick tea" like and not as "good" as some of my meat of fish based dishes so I'd feel like I needed to make more of an effort. The halloumi fajitas have always gone down a storm though and they're great if you have a mixed veggie/meat eating audience as you can do a tray with halloumi and a tray with chicken. Also, having said that my garlic bread is fairly universally celebrated so I can get away with serving almost anything with it and guests are usually happy!